Cuteness is in the eyes of the beholder, just like beauty is.

Yet, there is often consensus in what is cute and what is not.

Art and drawings may be cute:

cute image

By far most people find small animals cute. Here the kitten is clearly more optimistic and enthousiastic, maybe even to the point of desperation, than the cat:

cat, kitten, and kitty image

Cuteness is often social:

dog, cute, and puppy image

When small children can be themselves, that can beat all other cuteness:

pink dress image